Notes and link to the YouTube video on Lumped-element circuit analysis of Transmission Lines

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Design equations of Rectangular Microstrip Patch Antenna

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Following design equation can be used to calculate the width and length of rectangular microstrip patch antenna and simulation of 2.4 GHz inset-feed rectangular patch antenna can be found in follwing video.  Microstrip antenna with inset-feed line                           Part-1 Design step for the calculation of W and L Step-1 : To calcualte width 'W' use follwing formula Step-2:   Calculate the effective dielectric constant using formula below. Here    ' ε r '  is relative  dielectric constant of the material. 'h' is height of the substrate and W is the width of patch calculated in first step. Step-3:   Calculate ΔL using formula below. Step-4:   Calculate length of the patch using formula below. v 0    is speed of light in free space. Part-2 Feedline calculation Step-1:   Calculate the input impdedance of the patch using follwing formula. (Typically between 200  Ω  to 250  Ω. You can assume 225  Ω for simplic
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Spotters in "Hospital Waste Management" for CFM & MPH students

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 As per “Bio-medical Waste Management Rules, 2016”  1. Yellow Bin/ Bag: Type of Bag/  Container used:  Non-chlorinated  plastic bags Type of Waste:  1. Human Anatomical Waste A. Tissues, organs, body parts B. Foetus, Umbilical stump, placenta 2. Animal Anatomical Waste:  Tissues, Organs, body parts 3. Soiled Waste:  items contaminated with blood and body fluids A. Dressings, sponges, gauze B. Plaster casts C. Cotton swabs D. Blood bags E. Infected gowns, mask, shoe covers, cap 4.  Expired or Discarded  Medicines:   including antibiotics (except cytotoxic) 5. Chemical Waste: A. Discarded disinfectants, Cleaning agents B. X-ray film developing liquid, Infected secretions C. Aspirated body fluids, Liquid from laboratories 6. Microbiology, Biotechnology, and other clinical  lab waste 7. Chemical Liquid Waste Yellow bin/ bag with the cytotoxic label: 1. Used, discarded, and expired cytotoxic drugs whether in plastic vaccutainers, syringes, glass  vials, ampoules, glass bottles. The containe
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Spotters in "Environment and Health: Water" for CFM & MPH students

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  1. Sanitary well: Important points: Location: Not less than 15 m (50 feet) from likely sources of contamination & at a higher elevation. Not more than 100 m from houses Lining: Should be made up of bricks/ stones & cement up to a depth of at least 6 m (20 feet) and 60-90 cm (2-3 feet) above the ground Parapet wall: up to a height of 70-75 cm (28 inches) above the ground Platform: Extending at least 1m (3 feet) in all directions with a gentle slope towards the drain. Drain: pucca drain around the well to carry off spilled water to a public drain or soakage pit. Covering: Top closed by a cement cover. Hand pump: If possible it should be equipped with a hand pump in a Sanitary manner. 2. Slow sand filter: Important points: Space: Occupies a large area Rate of filtration: 2-3 m.g.a.d The effective size of sand: 0.2-0.3 mm Preliminary treatment:  Plane sedimentation. Washing: By scraping the sand bed Operation:  Less skilled Loss of head allowed:  4 feet (1.5 m) Removal
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Spotters in "Environment and Health: Mosquito control Measures" for CFM & MPH students

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The integrated approach of mosquito control: This is an approach that avoids the excessive use of any one method (e.g insecticides) but tries to combine one or more methods with a view to obtain maximum results with minimum inputs and also to prevent environmental pollution with toxic chemicals & development of insecticide resistance. The various methods of mosquito control are as follows: 1. Anti- Larval Measures: (a) Environmental Control: Important Points: Source reduction : Mainly the elimination of mosquito breeding places by minor engineering methods such as  Filling- of cesspools & open ditches and arrangement for adequate collection, removal, and disposal of sewage & wastewater. Leveling & getting rid of water-holding containers such as discarded tins, empty pots, broken bottles, coconut shells, etc. Drainage of breeding places, and  Water management (e.g intermittent irrigation) & removal of aquatic plants or destruction by herbicides. Rendering the water u
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How to design a reconfigurable antenna? Step-by-step process.

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Determine the frequency range and bandwidth requirements for the antenna. Choose an appropriate antenna structure, such as a patch antenna, microstrip antenna, or planar inverted-F antenna (PIFA). Choose the reconfigurable component, such as PIN diodes, switches, or varactor diodes. Design the impedance matching network, which is essential for optimal performance of the antenna. Simulate the antenna using electromagnetic simulation software, such as CST Microwave Studio, Ansys HFSS, or Keysight ADS, to verify its performance. Fabricate the antenna and integrate the reconfigurable component. Test the antenna in an anechoic chamber to verify its performance and ensure that it meets the requirements. Repeat steps 5-7 as necessary to optimize the antenna's performance. Note: These are general steps for designing a reconfigurable antenna and may vary depending on the specific requirements and constraints of the application.
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ORS : A boon in dehydration

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What is ORS? Oral re-hydration salts: It is a glucose-electrolyte formula given by WHO/UNICEF, used for correction of acute diarrhea due to all causes and dehydration in all age groups with aim to reduce mortality. It is available in powder form in sachets/ ready-made solution or it can be easily made at home. How it works? The combination of electrolytes and sugar together stimulates water and electrolyte absorption from the gut and hence  capable of correcting water and electrolyte deficit in conditions such as diarrhea and vomiting. Reasons to celebrate ORS day? ORS Day is celebrated every year on 29th July:  To spread awareness about the importance of Oral Rehydration Salts (ORS) as a low cost method of health intervention.   Among infants and young children, acute diarrhoeal diseases are one of the leading causes of mortality in many developing countries.   Dehydration particularly affects infants, children and old people.  Diarrhea normally lasts for several days, and leaves the
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Spotters in "Environment and Health: Mosquitoes- Anopheles" for CFM & MPH students

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Anopheles Mosquito: Also known as the sophisticated mosquito. The flight range is 3-5 km. Around 45 species of anopheles mosquitoes have been found in India but only a few of them have been incriminated as vectors or carriers of malaria. These are An. fluviatilis & An. minimum (foot-hill regions), An. sundaicus & An. stephensi (coastal regions) and An culicifacies & An. philippinensis (planes). 1. Eggs: Important points: Eggs laid on the surface of the clean water. 100-250 at a time. This stage lasts for 1-2 days. Laid singly, boat-shaped & possess lateral floats. 2. Larva: Important points: The larva is a free-swimming creature. Passes through 4 stages called ' instars ' with moulting between each stage. Floats horizontally in water/ rests parallel to the water surface. No siphon tube at the tip of its abdomen.  Palmate hairs present on abdominal segments. 3. Pupa: Important points: The pupa is comma-shaped in appearance, with a large rounded cephalothorax and
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Spotters in "Family Planning: Natural Contraceptive Methods" for CFM & MPH students

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  1. Safe Period/ Rhythm method/ Calendar method: Important points: Fertile period: Shortest cycle minus 18 days (Last day of fertile period: Longest cycle minus 10 days) Drawbacks:   Difficult to predict safe period in irregular cycles Only suitable for educated couple with high motivation Programmed sex: Abstinence required for 1/2 month Not useful in postnatal period High failure rate: 9 per HWY Medical complications: Ectopic pregnancies & embryonic abnormalities References: Park, K. (2019). Park's textbook of preventive and social medicine. 25th.  Jabalpur, India: M/S Banarsidas Bhanot . Kadri AM. (2019). IAPSM's Textbook of Community Medicine. 1st. New Delhi, India: Jaypee Brothers Medical Publishers (P) Ltd. https://thefactfactor.com/facts/pure_science/biology/natural-methods-of-contraception/1885/  photo credit
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